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Suboxic diagenesis in banded iron formationsAnomalous isotopic composition has been reported for the carbon in carbonate minerals of banded iron formations. Well studied examples show an enrichment in the light isotope of carbon, C-12. This enrichment presumably reflects unusual circumstances in the deposition of these sedimentary rocks. It is suggested here that the isotopically light carbonate results from early diagenetic oxidation by bacteria of substantial amounts of isotopically light organic carbon. The electron acceptor that permits oxidation in the absence of free oxygen is presumed to be Fe(III), which may have been significantly more abundant in the initial chemical precipitate than in the postdiagenetic sedimentary rock.
Document ID
19840053975
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Walker, J. C. G.
(Michigan, University Ann Arbor, MI, United States)
Date Acquired
August 12, 2013
Publication Date
May 24, 1984
Publication Information
Publication: Nature
Volume: 309
ISSN: 0028-0836
Subject Category
Geophysics
Accession Number
84A36762
Funding Number(s)
CONTRACT_GRANT: NAGW-176
Distribution Limits
Public
Copyright
Other

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